Battery then construction

Abstract

To provide a battery adhesive structure with good thermal conductivity and adhesive properties. [Solution] The battery bonding structure comprises a first protrusion projecting downward from the bottom surface of the secondary battery, a second protrusion projecting upward from an opposing surface of the case housing the secondary battery that is opposite to the bottom surface and located horizontally between the first protrusions, and a thermal conductive adhesive provided between the bottom surface and the opposing surface.

Description

Technical Field

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[0001] The present disclosure relates to a battery adhesion structure.

Background Art

[0002] Patent Document 1 discloses a heat transfer device for a battery pack in which a metal heat conduction member is disposed on the lower surface of a battery pack in which a plurality of single cells are arranged in parallel. In this technology, cold or warm heat from the metal heat exchanger is transmitted to the battery pack through the metal heat conduction member, so that all the single cells can be efficiently cooled or heated.

Prior Art Documents

[0007] According to this disclosure, a battery adhesive structure with good thermal conductivity and adhesion can be realized. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 shows a cross-section of the battery adhesive structure. [Figure 2] Figure 2 shows the bottom surface of the secondary battery and the opposing surface of the case. [Figure 3] Figure 3 shows the bottom surface of the secondary battery and the opposing surface of the case. [Modes for carrying out the invention]

[0009] A battery adhesive structure according to an embodiment of this disclosure will be described with reference to the drawings. Note that the components in the following embodiments include those that are easily substituted or substantially identical to those that are easily substituted by a person skilled in the art.

[0010] (Embodiment) Figure 1 shows a cross-section of the battery bonding structure. As shown in Figure 1, the battery bonding structure 1 bonds the secondary battery 2 and the case 3 using a thermal conductive adhesive 4.

[0011] The secondary battery 2 is a secondary battery such as a lithium-ion battery. The secondary battery 2 is a battery cell or a stack of stacked battery cells. A first protrusion 2b is formed on the bottom surface 2a of the secondary battery 2, protruding downward from the bottom surface 2a of the secondary battery 2.

[0012] Case 3 houses the secondary battery 2. A second protrusion 3b is formed on the opposing surface 3a of Case 3 that faces the bottom surface 2a of the secondary battery 2, protruding upward from the opposing surface 3a of Case 3.

[0013] The thermal conductive adhesive 4 is provided between the bottom surface 2a of the secondary battery 2 and the opposing surface 3a of the case 3.

[0014] Figure 2 shows the bottom surface of the secondary battery and the opposing surface of the case. As shown in Figures 1 and 2, the first protrusion 2b and the second protrusion 3b are cylindrical in shape, becoming thinner towards the tip. The lengths of the first protrusion 2b and the second protrusion 3b are preferably such that they do not interfere with each other due to dynamic displacement input from the vehicle.

[0015] Furthermore, the second protrusion 3b is located between the first protrusions 2b in the horizontal direction. The first protrusions 2b and the second protrusions 3b may be arranged in a staggered pattern, alternating in two dimensions in the horizontal direction. However, the arrangement of the first protrusions 2b and the second protrusions 3b is not particularly limited, as long as they do not interfere with each other.

[0016] According to the battery bonding structure 1, the formation of the first protrusion 2b and the second protrusion 3b increases the contact area between the bottom surface 2a of the secondary battery 2 and the thermal conductive adhesive 4, and the contact area between the thermal conductive adhesive 4 and the opposing surface 3a of the case 3. As a result, the thermal conductivity from the secondary battery 2 is improved, and the adhesion between the secondary battery 2 and the case 3 is also improved. Due to the improved adhesion, the secondary battery 2 is less likely to detach from the case 3 even in cases of aging deterioration or displacement input from the vehicle.

[0017] (modified version) Figure 3 shows the bottom surface of the secondary battery and the opposing surface of the case. As shown in Figure 3, the first protrusion 2Ab and the second protrusion 3Ab are elliptical cylinders that become thinner towards the tip. Similar to the embodiment, the bottom surface 2Aa has a first protrusion 2Ab that protrudes downward from the bottom surface 2Aa. The opposing surface 3Aa has a second protrusion 3Ab that protrudes upward from the opposing surface 3Aa.

[0018] As shown in the modified example, the cross-sectional shapes of the first and second protrusions are not limited to circles, but may be elliptical. Furthermore, the first and second protrusions are not limited to cylinders or cones, but may be rectangular prisms or the like. Moreover, the first and second protrusions only need to have a shape that increases the contact area between the bottom surface of the secondary battery and the thermal conductive adhesive, and the contact area between the thermal conductive adhesive and the opposing surface of the case, and may be spatula-shaped, plate-shaped, or uneven.

[0019] In the embodiment, an example in which the secondary battery 2 is adhered onto the case 3 has been described, but the present invention is not limited thereto. The secondary battery 2 may be directly adhered onto a cooler for cooling the secondary battery 2. In this case, a second convex portion may be formed on the opposing surface of the cooler that faces the bottom surface 2a of the secondary battery 2.

[0020] Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments expressed and described as above. Accordingly, various changes can be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and their equivalents.

Description of Reference Numerals

[0021] 1 Battery adhesion structure 2 Secondary battery 2a, 2Aa Bottom surface 2b, 2Ab First convex portion 3 Case 3a, 3Aa Opposing surface 3b, 3Ab Second convex portion 4 Thermal conductive adhesive

Claims

[Claim 1] The first protrusion protrudes downward from the bottom surface of the secondary battery, A second protrusion is located between the first protrusions in the horizontal direction, and is projected upward from the opposing surface opposite to the bottom surface of the case housing the secondary battery. A thermal conductive adhesive is provided between the bottom surface and the opposing surface, A battery bonding structure equipped with this feature.

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